I am looking for a end cap that has a flap/or damper kinda like a dryer vent or a downdraft vent has anyone heard of this??   My piep gets freezing when i don't use my stove and at times  i get condensation on my wall thimble...  however i am going through my foundation plus the brick on the outside of the house could that have anything to do with it?
	
		
			
		
		
	
				
			
	
	
			